Non-contact ultrasonic testing method

Abstract

The invention provides a non-contact ultrasonic testing method and belongs to the field of ultrasonic vibration testing. The method is characterized in that high-voltage pulses or alternating voltage is adopted to excite high-frequency vibration of a non-contact focusing probeand further to induce sound waves to be transmitted out, sound wave radiation energy is focused, focused sound waves are emitted to a shot point of a tested geologic model, ultrasonic waves are generated on the shot point and transmitted to the interior of the tested geologic model, simultaneously a detection point of the tested geologic model is detected to obtain voltage signals, and the voltage signals are converted to digital signals and transmitted to a computer to be processed. The non-contact ultrasonic testing method solves the problem of various normal geologic model simulation methods, can perform large-scale multipoint non-contact ultrasonic detection for complex surface models and meets special requirements of modern geophysical prospecting fine simulation.

Description

technical field [0001] The invention belongs to the field of ultrasonic vibration detection, and in particular relates to a non-contact ultrasonic detection method, which realizes vibration detection by generating and receiving ultrasonic signals in a non-contact manner under indoor conditions. Background technique [0002] Earthquake physical simulation research refers to the use of physical models to study earthquakes and related phenomena (especially fluctuation phenomena). It is an important part of experimental geology, also known as model geology. The most commonly used method in model geology studies is the ultrasonic method, and is therefore often referred to as ultrasonic seismic modeling. Ultrasonic seismic physical model experiments conduct indoor simulation observations of the propagation of seismic waves in various complex geological bodies through the observation of ultrasonic propagation in geological models, and conduct seismological research based on the obs...

AI Technical Summary

Problems solved by technology

[0011] Existing ultrasonic detection methods have certain shortcomings and limitations when used for geological model detection

[0012] ① Piezoelectric ultrasonic probes are relatively simple and low in price, but when performing geological model testing, there will be some problems when using piezoelectric probes for transmission and reception

The damage of this point will affect the next excitation effect at this point

When performing physical model detection, it is required to emit ultrasonic signals multiple times at the same emission point (we call it the shot point), which means that the point is irradiated by the intense pulsed laser source multiple times, and each irradiation is required The state of the previous point will not change, that is, the repeatability is good, but it is difficult to achieve this with an intense pulsed laser source

If the emission energy is reduced, the generated ultrasonic emission energy is not enough, and the signal cannot reach the deep layer of the model

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